LED VOLTAGE DISPLAY: This SAE adapter has a built-in voltmeter. Detect and display the voltage when power is on. It is also a very convenient way to tell you if the connection is successful.WIDE COMPATIBILITY: The SAE to USB adapter is designed for use on any 9-24 volt battery, and is used to charge any for iPhone, GPS, Camera, digital cameras, or any Smartphone or device that may be charged via USB.POWERFUL CAPACITY: With dual USB plugs, output 5V/2.1A 5V/2.1A. This motorcycle charger lets you charge any two smartphones or tablet devices simultaneously, at top speed.OVER-CHARGE PROTECTION: display the current detected by the intelligent circuitry while charging. Intelligent circuit design protects against excessive current, overheating, and overcharging. Ensure the charging safety.WATERPROOF DESIGN: Water and dust resistance by a rubber USB cover, protects internal circuit, effectively enhance its lifespan.Input Voltage: 9V-24VOutput Voltage: 5VOutput Current: 2.1A 2.1A max.Voltage Display Range: 12V-24VWorking Temperature: -40 to 70 ()Colour: BlackMaterial: ABS+PVCPackage Contents:1 x SAE to USB adapter1 x 1m SAE extension cableOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.